Display device and pixel structure thereof

Abstract

A pixel structure of a display device disposed on a substrate includes a plurality of sub-pixel structure. Each sub-pixel structure includes a light-absorption region, a reflection region, a first electrode disposed in the light-absorption region, a second electrode disposed in the reflection region, and a plurality of charge-carrying balls disposed over the first electrode and the second electrode. Each of the charge-carrying balls includes a white portion and a black portion. The white portion has a first conductivity type, and the black portion has second conductivity type.

What is claimed is: 
     
       1. A pixel structure, comprising:
 a substrate, comprising a light-absorption region and a reflection region; 
 a first electrode, disposed in the light-absorption region of the substrate; 
 a second electrode, disposed in the reflection region of the substrate; and 
 a plurality of charge-carrying balls, disposed on the first electrode and the second electrode, each of the charge-carrying balls comprising a white portion and a black portion, wherein the white portion has a first conductive type and the black portion has a second conductive type. 
 
     
     
       2. The pixel structure of  claim 1 , wherein in a bright display state, the first electrode has a voltage of the first conductive type, the charge-carrying balls are substantially disposed in the light-absorption region, the black portion of each of the charge-carrying balls is attracted by the first electrode, the black portion of each of the charge-carrying balls is substantially aligned facing a side of the first electrode, and the white portion of each of the charge-carrying balls is substantially aligned facing an opposite side with respect to the first electrode. 
     
     
       3. The pixel structure of  claim 1 , wherein in a dark display state, the second electrode has a voltage of the second conductive type, the charge-carrying balls are substantially disposed in the reflection region, the white portion of each of the charge-carrying balls is attracted by the second electrode, the white portion of each of the charge-carrying balls is substantially aligned facing a side of the second electrode, and the black portion of each of the charge-carrying balls is substantially aligned facing an opposite side to the second electrode. 
     
     
       4. The pixel structure of  claim 1 , wherein the first electrode comprises a plurality of first bar electrodes, the second electrode comprises a plurality of second bar electrodes, and the first bar electrodes and the second bar electrodes are interdigitatedly arranged. 
     
     
       5. The pixel structure of  claim 1 , wherein a material of the first electrode comprises a light-absorbing conductive material. 
     
     
       6. The pixel structure of  claim 1 , wherein a material of the second electrode comprises a reflective conductive material. 
     
     
       7. The pixel structure of  claim 1 , further comprising a light-absorbing layer disposed on the first electrode in the light-absorption region. 
     
     
       8. The pixel structure of  claim 1 , further comprising a reflective layer disposed on the second electrode in the reflection region. 
     
     
       9. The pixel structure of  claim 1 , wherein the white portion comprises a plurality of white particles, and the black portion comprises a plurality of black particles. 
     
     
       10. The pixel structure of  claim 1 , wherein the white portion is a white hemisphere, and the black portion is a black hemisphere. 
     
     
       11. The pixel structure of  claim 1 , wherein the first electrode and the second electrode are substantially disposed on a same plane. 
     
     
       12. The pixel structure of  claim 1 , wherein the first electrode and the second electrode are disposed on different planes, and the pixel structure further comprises an insulating layer disposed between the first electrode and the second electrode. 
     
     
       13. A display device, comprising a plurality of pixel structures disposed on a substrate, each of the pixel structures comprising a plurality of sub-pixel structures, each of the sub-pixel structures comprising:
 a light-absorption region and a reflection region; 
 a first electrode, disposed in the light-absorption region of the substrate; 
 a second electrode, disposed in the reflection region of the substrate; and 
 a plurality of charge-carrying balls, disposed on the first electrode and the second electrode, each of the charge-carrying balls comprising a white portion and a black portion, wherein the white portion has a first conductive type and the black portion has a second conductive type. 
 
     
     
       14. The display device of  claim 13 , wherein when each of the sub-pixel structures shows a bright display state, the first electrode has a voltage of the first conductive type, the charge-carrying balls are substantially disposed in the light-absorption region, the black portion of each of the charge-carrying balls is substantially aligned facing a side of the first electrode, and the white portion of each of the charge-carrying balls is substantially aligned facing an opposite side with respect to the first electrode. 
     
     
       15. The display device of  claim 13 , wherein when each of the sub-pixel structure shows a dark display state, the second electrode has a voltage of the second conductive type, the charge-carrying balls are substantially disposed in the reflection region, the white portion of each of the charge-carrying balls is substantially aligned facing a side of the second electrode, and the black portion of each of the charge-carrying balls is substantially aligned facing an opposite side with respect to the second electrode. 
     
     
       16. The display device of  claim 13 , wherein the first electrode of each of the sub-pixel structures comprises a plurality of first bar electrodes, the second electrode of each of the sub-pixel structures comprises a plurality of second bar electrodes, and the first bar electrodes and the second bar electrodes are interdigitatedly arranged. 
     
     
       17. The display device of  claim 13 , wherein a material of the first electrode of each of the sub-pixel structures comprises a light-absorbing conductive material. 
     
     
       18. The display device of  claim 13 , wherein a material of the second electrode of each of the sub-pixel structures comprises a reflective conductive material. 
     
     
       19. The display device of  claim 13 , further comprising a plurality of light-absorbing layers respectively disposed on the first electrode in the light-absorption region of each of the sub-pixel structures. 
     
     
       20. The display device of  claim 13 , further comprising a plurality of reflective layers respectively disposed on the second electrode in the reflection region of each of the sub-pixel structures. 
     
     
       21. The display device of  claim 13 , further comprising a plurality of color filters respectively disposed in the sub-pixel structures. 
     
     
       22. The display device of  claim 13 , wherein the first electrode and the second electrode are substantially disposed on a same plane. 
     
     
       23. The display device of  claim 13 , wherein the first electrode and the second electrode are disposed on different planes, and the display device further comprises an insulating layer disposed between the first electrode and the second electrode. 
     
     
       24. The display device of  claim 13 , wherein the white portion comprises a plurality of white particles, and the black portion comprises a plurality of black particles. 
     
     
       25. The display device of  claim 13 , wherein the white portion is a white hemisphere, and the black portion is a black hemisphere.